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Grade 7 - Mathematics
Changing the Subject of the Formula

The area of a rectangular field is the product of its length and breadth is expressed in symbols are A = l * b
Where A = Area
l = length
b = breadth
In, A = l * b, A is the subject of the formula. This is useful to find the value of A when the values of 'l' and 'b' are given.
Suppose the values of 'A' and 'l' are given and 'b' is to be found. The we have change the formula in such a way that 'b' is given in terms of 'A' and 'l' and 'b' is the subject of the formula.
A = l * b
Multiplying both sides by 1/l
1/l * A = l * b * 1/l.
A/l = b Therefore b = A/l.

Directions:Change the subject of the formula. Also write at least 5 examples of your own.
Q 1: I = (PTR)/100, Change 'P' as the subject of the formula.
P = 100I/TR
P = 100/ITR

Question 2: This question is available to subscribers only!


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